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CatchUI MCP Server

by catchui Your server? Claim it
not responding

CatchUI is listed as active in the registry but did not answer our last check. It exposes 6 tools.

What is this UI element called? 50 curated UI patterns, names per platform, build prompts. EN/中文.

Uptime history 29 days of history · worst day 0%
29 days agonow
2.2%
Uptime 24h
2 of 92 checks
6
Tools
read from the server
311 ms
Response time
average over 24h
open, no key
Access
streamable-http

CatchUI does not always answer

Over the last week it answered 14.7% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

run in your terminal
claude mcp add ui-patterns --transport http https://catchui.com/api/mcp
Settings → Connectors → Add custom connector, then paste this address
https://catchui.com/api/mcp
~/.codex/config.toml
[mcp_servers.ui-patterns]
url = "https://catchui.com/api/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "ui-patterns": {
      "url": "https://catchui.com/api/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "ui-patterns": {
      "type": "http",
      "url": "https://catchui.com/api/mcp"
    }
  }
}

Available tools 6

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

patterns
list_ui_patterns
Lists the 98 UI patterns in CatchUI's curated catalog — ids, English and Chinese names and one-line definitions — grouped by family, optionally filtered to one family (NAV, INPUT, ACTION, OVERLAY, FEEDBACK, CONTENT, DATA, SYSTEM).
search_ui_patterns
Finds the conventional name of a UI element or design pattern from a plain-language description, question or term — e.g. "the bar at the bottom of an app", "three horizontal lines icon", "the black bar at the top of iPhone", "汉堡菜单". Searches CatchUI's curated catalog of 98 patterns and returns names in English and Chinese, definitions, the best-matching Q&A and each entry's catalog URL. Use when someone asks what a UI element is called or what a UI/UX term means.
compare
compare_ui_patterns
Explains how 2 to 4 easily confused UI patterns differ — e.g. toast vs snackbar, modal vs popover vs bottom sheet, tabs vs segmented control, Dynamic Island vs notch. Returns each definition side by side plus the catalog's written comparison when one exists. Accepts ids, names or short descriptions.
component
get_ui_component_names
Returns what a UI pattern is called in code on each platform — SwiftUI, UIKit, Jetpack Compose, Android Views, Flutter, HTML/ARIA and, for system UI, AppKit, Win32 and Electron — or works backwards from a framework component (e.g. "UISegmentedControl", "ModalBottomSheet", "role=tablist") to the pattern and its equivalents elsewhere. Optionally filtered to one platform. Platforms without a native component say so instead of naming one.
implementation
get_implementation_prompt
Returns CatchUI's ready-to-use implementation instructions for 1 to 6 UI patterns — what to build, where it sits, its states and the accessibility it needs — in English or Chinese, for pasting into an AI coding tool such as Claude Code or Cursor. Accepts ids, names or short descriptions.
pattern
get_ui_pattern
Returns the full CatchUI entry for one UI pattern by id (e.g. "tabbar", "bottomsheet"): definition in English and Chinese, pronunciation, aliases, how people describe it, component names per platform, an implementation prompt, real search questions with answers, related patterns and the catalog URL. Takes an id; search_ui_patterns finds ids from descriptions.

Endpoints

URLTransportStateLatencyChecked
https://catchui.com/api/mcp streamable-http answering 92 ms 4 min ago

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CatchUI — questions

Answers built from our own checks of this server.

What can CatchUI do?
It exposes 6 tools, read directly from the server on our last check. Among them: compare_ui_patterns, get_implementation_prompt, get_ui_component_names, get_ui_pattern, list_ui_patterns, search_ui_patterns. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is CatchUI working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 2 of 92 checks got a reply (2.2%), average response time 311 ms. The bar chart above shows every period we have measured.
The registry lists CatchUI as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
How do I connect CatchUI?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does CatchUI need an API key?
No. CatchUI completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 6 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is CatchUI?
It answers our handshake in 311 ms on average, which is faster than 44% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.